Turbo Up-grade ??

[speedy1320]

I am new to this site.....I own an 87 WE-4 and have done some minor mods {3" DP, ATR Full Exhaust with 3" race-cat, Slightly larger injectors,ATR Chip, K&N filter, Magnecor wires} My question is....if I upgrade this "street" car with a TA-49 there are claims of 25 -30 horse increases......How is this achieved? It simply CANNOT be MORE boost....So how is the add'l power picked up? Does it cause FASTER spool-up?

Secondly, what are the Down-sides of a larger Turbo like this?

Thanks much!

Tom

 

[c&cgn]

The stock turbo is hard to beat when under 20psi and on the street. There are very little downsides to a TA49 or TE44, but your car probably won't be any faster on the street unless you get the boost up over 22psi where the stock turbo becomes way less effecient.

 

[GNSCOTT]

The horsepower gain is from added flow. A turbo flows air in as well as out. A 44 or 49 (same turbo cept cosmetics) will flow more in and out than a stock turbo. IMHO better flow at any boost level will improve performance. My old 70 turbo @ 10 PSi would kill a stock turbo @2 psi. I would think your HP levels with a 44 would be higher at all rpm's, not just at higher HP levels. hope that helps.